Serotonergic versus nonserotonergic dorsal raphe projection neurons: differential participation in reward circuitry.

Serotonergic versus nonserotonergic dorsal raphe projection neurons: differential participation in reward circuitry.
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血清素能与非凝集型背部Raphe投射神经元:差异参与奖励电路。

DOI:
10.1016/j.celrep.2014.08.037
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发表时间:
2014-09-25
期刊:
影响因子:
8.8
通讯作者:
Bonci A
Bonci A
中科院分区:
生物学1区
文献类型:
--
作者:
McDevitt RA;Tiran-Cappello A;Shen H;Balderas I;Britt JP;Marino RAM;Chung SL;Richie CT;Harvey BK;Bonci A

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中隔背核(DRN)包含大脑中最大的一组产生血清素的神经元,并投射到控制奖励的区域。尽管药理学研究表明5 -羟色胺抑制寻求奖励,但DRN的电刺激强烈地强化了工具行为。在这里,我们对5 -羟色胺能和非5 -羟色胺能DRN神经元在奖励过程中的行为、解剖和电生理贡献进行了有针对性的评估。为了探索DRN的异质性,我们在几种表达cre的转基因小鼠品系中同时使用了双载体敲除/光遗传刺激策略,以及cre诱导和cre沉默载体。我们发现DRN能够主要通过非血清素能神经元加强行为,其主要投射目标是腹侧被盖区(VTA)。此外,这些非血清素能投射提供了VTA多巴胺神经元的谷氨酸能兴奋,并占DRN-VTA通路的大部分。这些发现有助于解决血清素与DRN在行为强化中的作用之间的明显差异。
The dorsal raphe nucleus (DRN) contains the largest group of serotonin-producing neurons in the brain and projects to regions controlling reward. Although pharmacological studies suggest that serotonin inhibits reward-seeking, electrical stimulation of the DRN strongly reinforces instrumental behavior. Here, we provide a targeted assessment of the behavioral, anatomical, and electrophysiological contributions of serotonergic and non-serotonergic DRN neurons to reward processes. To explore DRN heterogeneity, we used a simultaneous two-vector knockout/optogenetic stimulation strategy, as well as cre-induced and cre-silenced vectors in several cre-expressing transgenic mouse lines. We found that the DRN is capable of reinforcing behavior primarily via non-serotonergic neurons, whose main projection target is the ventral tegmental area (VTA). Furthermore, these non-serotonergic projections provide glutamatergic excitation of VTA dopamine neurons and account for a large majority of the DRN-VTA pathway. These findings help to resolve apparent discrepancies between the roles of serotonin versus the DRN in behavioral reinforcement.
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